Not quite, hooowl.
It's more that they feel unmasculine.
But being an unmasculine man is difficult, and attracts negative attention from other men. Reconceptualising the self as feminine is an attempt to reconcile the dissonance of never fitting comfortably in the "man" box.
It's a very narcissistic way of thinking, unfortunately, because it involves requiring the rest of the world to interpret everything through the preferred lens of the "unmasculine" male.
And, of course, it falls down at the first feminist hurdle. Men who do not perform hypermasculine behaviours are still men.
If men who do not perform masculine behaviours are not men, then logically women who do not perform feminine behaviours are not women. I am therefore forced to redefine myself as some sort of unsexed ethereal being attached to an abused female body.
And, of course, it means everyone else who doesn't perform femininity to men's satisfaction is fair game for corrective rape, because they're not "real women" and so don't count.
It's a thoroughly revolting logic train, if you can stop thinking about the poor males and consider the female experience instead.
The female equivalent basically involves being repeatedly traumatised by dicks and trying to escape it by saying "please stop kicking me for not performing femininity; look, I'll even cut my tits off if it helps." Except mostly we're not quite narcissistic enough to insist everyone reconceptualises their own identities to accommodate us.